17..In the United States, bus travel doe
题型:选择题
问题:
17..In the United States, bus travel doesn't cost much as train travel, ?
18.
A.don't they
B.does it
C.do they
D.doesn't it
17..In the United States, bus travel doesn't cost much as train travel, ?
18.
A.don't they
B.does it
C.do they
D.doesn't it